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It is a way to lessen the strain on the server's resources (= faster page loading for more visitors the same time).

It does so by serving "pre-computed" static pages to the non logged-in visitors, and thus there is no need for a database query and various calculations for very visitor.
Thanks for answering, Can you please answer this question of mine (http://www.question2answer.org/qa/60668/external-login-configuration)? It's urgent!